Space Charge Effects in Resistive Plate Chambers

We extend an existing one dimensional simulation model for avalanche mode RPCs by the inclusion of diffusion and space charge effects. We investigate the influence of space charge on charge spectra, signal rise time, time resolution and charge-to-time correlation. We present a 1.5 dimensional model, which allows fast simulation of events and a two dimensional model that is slower but allows to study the transverse dispersion of avalanches due to space charge.